Check for revolving doors



G. J. CRUIJFF'AND .S. B. VAN AALTEN.

CHECK FOR REVOLVING DOORS.

APPLICATION FILED JULY (H1920.

Patented Nov. 14, 1922.

* VIIIIIIIIIIIIIIIIIIIYII6I| Patented Nov. 14, 1922.

Unitas mm PATEN? orrrca.

CORNELIS JonAnnEsoRUIJFF AND SIMON BERNHARD V'ANAAL'T N, or AMsTERnAM,

NETHERLANDS.

, CHECK on n nvonvrnenoons.

Application filed-July e, 1920. serialNo. aha i375.

To all whom it may concern.

Be it known that Connnnrs JOHANNES CRUIJFF, architect, asulnect of the Queen of the Netherlands, and a citizen of the city.

Improvements ,in Checks for Revolving Doors, of which the following is a specification.

This invention relates to checks for revolving doors comprising-a middle wall and two Wings at the ends thereof, said wings being curved like the segments of a. circle, the same being used with a door casing having similar segment-like walls. The object of said invention is to lessen the velocity of rotation and ensure that/the door will always come to a stop position with the wings inside of the corresponding parts of the door-casing. H eretofore such action has been imperfectly effected byv means which allow some irregularity of resistance of the door to rotation and'cause needless noise and I wear. To remedy these defects our invention consists in' the devices and combinations hereinafter moreparticularlyset forth and claimed.

On the accompanying drawing the inven-:

tion is illustrated. a I

Fig. 1 is a vertical section through the apparatus in the position in which the/pistons are in the middle of stroke and in whichthe door is in the position of rest.

Fig. 2 shows a horizontal section on the line A'-B of Fig. 1'.

inder in an enlarged scale on the lines C-D and E--F of Fig. 1 respectively.

F igj 5 shows another construction of the means for stopping' thedoor in the position of rest. j

Figure 6 represents a longitudinal central sectional view similar to Figure 1f of themodification shown in Fig. 5. y p

l is the door-casing within which the door revolves on the shaft 2 provided with a crank 3. The connection-rod of said crank is connected with its free end by means of a link to a Vertical rod-'5, is fastened at thebottomend to thepiston-rod 6 and at the top endto a rod 7 slidably mounted in rings 8, which are fixed to the door-casing.

The piston-rod 6 carries the pistons 12, whlchmove in a cylinder 11 fastened to the door-casing. The cylinder 11 is closed at both ends and provided in the middle with an opening 19for allowing, a to andfro movement of the rod 5 and for the filling of the cylinder 11 with asuitable liquid. as for example oil. Further a canal 14 extending from one end to the otheris provided in the piston-rod 6 and the-pistons 12' and this canal 14 may wholly or. partially be closed by means of an adjusting-screw. 20. for the purpose of regulating the resistance of the pistons against .the'rotationof the door.

Besides, this the pistons '12 are provided with apertures 18. which can be shut off by means ofvalves 15, made of leather or similar material, and, fastened to the pistons12 by means of screws17 (Fig. 3) and said valves areprovided withopenings 16 correspending with the canal. 14:.

To both sides of the point of connection with the rod 5 compression springs are arranged on: the rod 7 saidsprings pressing at the one end against the rings '8 and at the other end-againstfscrew-nuts 10 arranged on the rod 7 and allowing the tension of the said compression springs c9=to be regulated.

lowing? v When, after the cylinder llhas been filled with a suitable liquid,'for example oil, and after adjustment of the screw 20 and The working of the apparatus is thefo1- screw-nutszlO, the door moves out of the position; of rest 'and in the'direction indicated on Figure 2 of the drawing by an arrow,

. i V thenthe' right" hand. spring 9 will becom Figs, 3 and l: are sections'through the cylpro'ach'the end of the stroke. During this movement of the pistons-the liquid, for example oil, contained in the room within the cylinder '11 in front of the right hand piston 12 cannot escape through the openings 18 in said piston as the same are closed by the valve 15 being pressed against the front of said piston, and therefor this liquid is obliged to flow through the canal it into the space contained within the cylinder 11 at the back of the left hand piston 12; further the liquid which may have reached the space within the cylinder 11 between the two pistons 12, for example by leakage, is also allowed to reach the space within the cylinder 11 at the back of the left hand piston 12 and this to flow through the opening 18 in said left hand piston, which are uncovered as the valve 15 is standing apart from the back of said piston. I

After the door has passed through the first angle of 90 degrees and after the pres sure of the public passing through has ceased, the door passes through the next angle of 90 degrees in consequence of its own kinetic energy and in consequence of the expansion of the compressed spring 9 or tendency of the weight 27 to take a lower position. During this period the resistance of the pistons against the rotation of the door gradually increases as said pistons approach the middle of the stroke and in consequence thereof the door will be brought to a stop in the position of rest, in which the wings are inside of the segment-like walls of the door-casing.

As in this position of the door the pistons offer the greatest resistance against a rotation of the door and as the left hand spring9 is compressed or weight-27 is raised again as soon as the door has passed through the position of rest, the same will come to a stand-still without any oscillating.

Instead of the rod 7 and the compression springs 9 the oonlstr'uction illustrated in. Fig. 5 may be used. This construction, in which the connection-rod at of the crank 3 is tuh rnwl and fixed with its fulcrumed end to the piston-rod 6, consists of a lever 25, oscillating on a shaft 26, which is supported by girders 28 carried by the walls of the door-casing. The lever 25 is loaded at one end with a weight 27 and provided at the opposite end with a roller 24, pressed by said weight to the bottom side'of a disk 23 mounted on the shaft 2. Now the said bottom side ofthis disk is recessed and shaped in such manner that. the weight takes the lowest position when the door is inthe position of rest and is raised and takes the highest position when the door has passed through. an angle of 90 degrees.

hat we claim is:

1. An improvement in checks for revolving doors consisting in a pair of pistons moving in a cylinder and moved by the ro tation of the door in such a manner that the said pistons take the middle of the stroke when the door is in the position of rest.

2. An improvement in checks for revolving doors consisting in a pair of pistons moving in a cylinder and connected to the rotating shaft of the door by a connectionrod and a crank provided on said shaft, said pistons being mounted in such a way that they take the middle of the stroke when the door is in the position of rest.

8. An improvement in checks for revolving doors consisting in a pair of pistons connected by a connection-rod to a crank provided on the rotating shaft of the door and moving in a cylinder fixed to the doorcasing in such a manner that the pistons.

take the middle of the stroke when the door is in the position of rest in combination with means for bringing the door to astop as soon as the same has reached the position of rest. 7

4. An improvement in checks for. revolving doors consisting in a pair of pistons connected by connection-rodto a crank provided on the rotating shaft of the door and moving in a cylinder fixed to the door-.

casing in such a manner that the pistons take the middle of stroke when the door is in the position of rest, in combination with compression springs arranged on a rod moving to and fro with the piston-rod in such a manner that one of the springs is compressed when the door is moved out of the position of rest and is passing through the first angle ofv degrees.

An improvement. in checks for revolving doors consisting in a pair of pistons connected by a connection-rod to a crank provided on the rotating shaft of the door and moving in a cylinder fixed to the doorcasing in such a manner that the pistons take the middle of stroke when the door is in the position of rest in combination with a rocking lever supported by thegdoor-oasing and provided at one end with a weight and at the other end with a roller pressed by the weight against the bottom side of a disk fixed on the rotating shaft of the door,-said bottom side being shaped in such a manner that the weight takes the lowestposition when the door is in the position of rest and is raised into the highest position when the door has passed through the first. angle of 90 degrees.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

CORNELIS JOHANNES CRUIJFF. SIMON BERNHARD VAN AALTEN. Witnesses: v

Y. C. G. KUIJPERE, I. YHANGENDJK. 

